Radar Level Field Installation Inspection Before Commissioning

Pre-commissioning inspection should find physical defects before software is used to compensate for them. A radar may power up and display a plausible value while its antenna is recessed, reference plane is wrong, beam is obstructed, seal is incompatible or shield grounding is incomplete. The inspection must compare the installed assembly with approved drawings and model-specific requirements, record deviations and close critical defects before configuration and loop testing. This preserves a clear boundary between mechanical completion and measurement commissioning.

Confirm equipment identity

Check tag, manufacturer, full model code, serial number, firmware, antenna, process connection, housing, cable entries, output and approval marking against the approved datasheet. Photograph the nameplate and assembly. Verify supplied adapters, barriers, surge devices and displays; similar-looking accessories can change pressure, certification or signal performance.

Measure the installed geometry

Record nozzle bore and length, internal welds, antenna projection, orientation, empty distance, tank zero and maximum-level clearance. Confirm the reference plane through all adapters and extensions. Compare the full beam envelope with ladders, coils, agitators, walls, fill streams and moving structures rather than checking only the centre line.

Inspect pressure and material interfaces

Verify process seal, gasket, flange rating, bolt class and exposed materials against product, concentration, temperature, pressure, vapour and cleaning chemicals. Confirm installation torque or procedure where specified. Check that drainage, purging or thermal extensions match the certified design and that no unapproved cover obstructs the antenna.

Check mounting stability and access

Inspect bracket rigidity, alignment, roof deflection, vibration exposure and weather protection. Confirm the instrument can be isolated, inspected and removed safely under site procedures. Cables should have strain relief, drip loops and suitable bend radius, and maintenance should not require avoidable confined-space entry or exposure to the process.

Verify wiring and grounding

Check supply, polarity, loop voltage, cable type, shield termination, grounding, barrier channel and surge protection. For RS485, confirm topology, polarity, termination and address schedule. Seal unused entries, verify gland size and environmental protection, and keep signal routes clear of avoidable high-power interference.

Close deviations before testing

Create a punch list with drawing reference, defect, risk, owner and due date. Correct items that affect pressure integrity, hazardous compliance, beam path, reference geometry or protection before startup. Record approved minor deviations in as-built drawings so commissioning and future maintenance work from the real installation rather than an obsolete design.

Protect the commissioning baseline

Do not alter range, false-echo mapping or damping to make a mechanically incomplete installation appear acceptable. Record the first diagnostic curve and reference dimensions before configuration work so later changes remain traceable. If testing must proceed with a temporary bracket, open nozzle or unfinished cable route, label the result as preliminary and repeat the affected checks after completion. Mechanical acceptance should also identify the person responsible for maintaining the reference marks and as-built drawing. This prevents a later bracket or adapter change from becoming an unexplained calibration or echo fault.

Mechanical release evidence

Release the installation only after photographs and measurements show antenna projection, nozzle clearance, orientation, bracket rigidity, gasket condition and cable entry. Mark the vessel datum and record empty and full reference distances on the as-built drawing. Where the antenna cannot be inspected after filling, make this a witnessed hold point. These records give maintenance teams a reliable starting point and prevent configuration changes from being used to compensate for a mechanical defect that should have been corrected before commissioning.

Engineering checklist

Match every device and accessory to approvals.
Measure nozzle, antenna and reference geometry.
Verify seals, materials and pressure boundary.
Confirm stable mounting and safe access.
Inspect wiring, shielding and grounding.
Close critical punch-list items before commissioning.

Frequently asked questions

Can configuration correct a recessed antenna?

No. Mechanical near-field problems should be corrected physically where possible.

When is mechanical completion accepted?

After critical defects are closed and as-built geometry and deviations are documented.

Why photograph the installation?

Photographs preserve orientation, accessories and conditions that may become hidden or inaccessible later.

Need a project-specific review? Send process data, drawings, photographs and acceptance criteria through our contact page.